pub fn test() {
    let n = 5;
    if n < 0 {
        print!("{} is negative", n);
    } else if n > 0 {
        print!("{} is positive", n);
    } else {
        print!("{} is zero", n);
    }
    let big_n = if n < 10 && n > -10 {
        println!(", and is a small number, increase ten-fold");
        n * 10
    } else {
        println!(", and is a big number, half the number");
        n / 2
    };
    println!("{} -> {}", n, big_n);
}
